Unhandled exception at 0x76fb2073 in Screen.exe: 0xC0000005: Access violation writing location 0x00000000

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Visual-Studio

DirectX

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When I build my project and run game, I get this error always.

Unhandled exception at 0x76fb2073 in Screen.exe: 0xC0000005: Access violation writing location 0x00000338 or sometimes 0x00000000.

When I debug this error, I can see the free.c source file.

else    //  __active_heap == __SYSTEM_HEAP
    #endif  /* _WIN64 */
    {
        retval = HeapFree(_crtheap, 0, pBlock);
        **if (retval == 0)                  // Here, error occured**
            {
            errno = _get_errno_from_oserr(GetLastError());
            }
        }
    }

When I trace this debug path, I found that error occured on this line on my screen.cpp file.

if(FAILED(D3DXLoadMeshFromX(szName, D3DXMESH_SYSTEMMEM,
        m_pd3dDevice, &pAdjacencyBuffer,
        &pD3DXMtrlBuffer, NULL, &pMesh->dwNumMaterial,
        &pMesh->pMesh)))

I can't know why this error occur all time when I run this game.

Need your help!